This is a design I made inside of Blender. The back doesn't go all the way through, it's only imprinted a little bit (water doesn't even seep through). I would recommend using ninjaflex as your filament, I am not sure if it will fit if not made with stretchy filament.
Also, make sure when you put it in the case you put the top (with the camera) in first and then the back. The bottom is a little more fragile than the top so be careful with it.
s6casehexagon.stl | 5.7MB |